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SubjectLockup in 2.4.2 kernel ADSL PCI card ATM driver module
Date
Kernel community,

Sorry for intrusion, but I could use some guidance and/or direction in
tracking
down the source of a problem. None of the messages I have seen in the
archives quite seem to match this problem (if there is one please let me
know). I am looking for where or how to dig (deeper) to find the source of
the problem (described below).
Please CC me with any responses at
dan.davidson@conexant.com

Thanks much (in advance of any help),
Dan Davidson
dan.davidson@conexant.com
Conexant Systems, Inc.


SUBJECT:
Lockup in 2.4.2 kernel ADSL PCI card ATM driver module


DRIVER RESULTS:
Works fine in 2.4.0 kernel.
Locks up system (no messages/oops/etc.) in 2.4.2-2 kernel (rh 7.1).
Locks up system (no messages/oops/etc.) in 2.4.2 kernel (w/ or w/o kgdb).
Locks up system with "int 3" ??????? message in 2.4.2-ac28 kernel.


PROBLEM:
We are developing reference design Linux drivers for our PCI ADSL
reference design hardware. We have had drivers working (not crashing
and able to transfer data) for kernel version 2.4.0.
Yet the same source code for the driver, compiled with each kernel
version, (and working fine for 2.4.0 kernel) causes system lockup
on 2.4.2 kernel versions.
The driver is a kernel module ATM driver for a Conexant PCI ADSL card.


SYSTEM:
Dell Dimension XPS 300
Pentium II 300 MHz
128MB RAM
Maxtor 31024H2 (ATA) HD
CDROM (ATAPI)
Iomega Zip100 (ATAPI)
1.44 FD
3COM PCI ethernet
Conexant PCI ADSL


FILES:
Several of the patch files, ".config" files, partial "System.map",
and output of dmesg can be found at "http://home.hiwaay.net/~rss1/linux"
and within the "2.4.0" and "2.4.2" subdirectories and the subdirectories
of "2.4.2" ("2", "ac28", and "kgdb").


2.4.0 KERNEL:
Start with Red Hat Linux 6.2 release.
Upgrade to kernel 2.4.0 (lilo for both 2.2.14-5 and 2.4.0)
applying patches "br2684-001212-against2.4.0.dif" and "atm-hdlc-patch"
and using "config.gz" as ".config".
Build kernel.
Install rpm "modutils-2.4.0-1.i386.rpm".
Install rpm "atm-0.78-1.i386.rpm".
Install Conexant ADSL driver.


2.4.2-2 (rh) KERNEL:
Start with Red Hat Linux 7.1 release.
Apply patches "br2684-001212-against2.4.2.dif" and "atm-hdlc-patch".
Configure kernel for:
code maturity - experimental
loadable module support - enable loadable and kernel module support
networking options - enable ATM and classical IP over ATM
and set to module enable LAN Emulation, multi-protocol over ATM,
and RFC1483/2684 bridged protocols
network device support - module enable PPP and PPPoATM
Build kernel.
Install rpm "atm-0.78-1.i386.rpm".
Install Conexant ADSL driver.


2.4.2-kgdb KERNEL:
Start with Red Hat Linux 7.1 release.
Add kernel 2.4.2 (lilo for both 2.4.2-2 and 2.4.2-kgdb)
Apply patch "linux-2.4.2-kgdb.patch".
Apply patches "br2684-001212-against2.4.2.dif" and "atm-hdlc-patch".
Configure kernel for:
code maturity - experimental
loadable module support - enable loadable and kernel module support
networking options - enable ATM and classical IP over ATM
and set to module enable LAN Emulation, multi-protocol over ATM,
and RFC1483/2684 bridged protocols
network device support - module enable PPP and PPPoATM
Build kernel.
Previously installed rpm "atm-0.78-1.i386.rpm".
Install Conexant ADSL driver.


2.4.2-ac28 KERNEL:
Start with Red Hat Linux 7.1 release.
Add kernel 2.4.2 (lilo for both 2.4.2-2, 2.4.2-kgdb, and 2.4.2-ac28)
Apply patch "patch-2.4.2-ac28".
Apply patches "br2684-001212-against2.4.2.dif" and "atm-hdlc-patch".
Configure kernel for:
code maturity - experimental
loadable module support - enable loadable and kernel module support
networking options - enable ATM and classical IP over ATM
and set to module enable LAN Emulation, multi-protocol over ATM,
and RFC1483/2684 bridged protocols
network device support - module enable PPP and PPPoATM
Build kernel.
Previously installed rpm "atm-0.78-1.i386.rpm".
Install Conexant ADSL driver.


MESSAGE GENERATED IN 2.4.2-ac28:
int 3: 0000
CPU: 0
EIP: 0010:[<c885478b>]
EFLAGS: 00000282
eax: c8854780 ebx: 00000000 ecx: c02873e8 edx: c100df74
esi: 00000000 edi: 00000000 ebp: c14e5f28 esp: c14e5f20
Process insmod (pid: 1401, stackpage-c14e5000)
Stack: c884d000 00000000 00000060 c0114c35 00000000 c0349000 000860a0
c034a000
00000060 ffffffea 00000007 c6979fdc 00000060 c8845000 c884d060
000ae220
00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000
Call Trace: [<c884d000>] [<c0114c35>] [<c8845000>] [<c884d060>]
[<c0106ffb>] [<c
010002b>]

Code: 83 ec 0c 68 d0 17 8b c8 e8 e8 f6 8b f7 c7 04 24 00 18 8b c8
make[1]: *** [start] Segmentation fault


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